Computer Scientist, Philosopher, Web Developer
Reach me by email howard.yeend@gmail.com.
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When I started building websites, before browsers had nice tools for developers, I found that an easy way to see the underlying structure was to put a thin red border on everything.
The way to do that is to add the following instruction:
* {outline: 1px solid red;}
So that's where solid red came from. Why red? Simple; it's the quickest colour to type.
I know you're dying to see what the page looks like with red outlines so here you go. Pretty neat, eh?